Armature winding of rotating electrical machine

ABSTRACT

According to one embodiment, there is provided a 3-phase 2-pole 2-layer armature winding, housed in 72 slots provided in a laminated iron core, a winding of each phase including six parallel circuits separated into two phase belts. Upper coil pieces of first and fourth parallel circuits are placed at 3rd, 4th, 7th, and 12th positions, and lower coil pieces of the first and fourth parallel circuits are placed at 1st, 6th, 9th, and 10th positions, upper and lower coil pieces of second and fifth parallel circuits are placed at 2nd, 5th, 8th, and 11th positions, and upper coil pieces of third and six parallel circuits are placed at 1st, 6th, 9th, and 10th positions, and lower coil pieces of the third and six parallel circuits are placed at 3rd, 4th, 7th, and 12th positions, from the center of a pole.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Divisional Application of U.S. application Ser.No. 14/809,967 filed Jul. 27, 2015, which is a Divisional Application ofU.S. application Ser. No. 14/623,260 filed Feb. 16, 2015, now U.S. Pat.No. 9,130,428 issued Sep. 8, 2015, which is a Divisional Application ofU.S. application Ser. No. 14/286,339 filed May 23, 2014, now U.S. Pat.No. 9,035,525 issued May 19, 2015, which is a Divisional Application ofSer. No. 13/973,552 filed Aug. 22, 2013, now U.S. Pat. No. 8,803,397issued Aug. 12, 2014, which is a Divisional Application of U.S.application Ser. No. 13/270,650 filed Oct. 11, 2011, now U.S. Pat. No.8,536,755 issued Sep. 17, 2013, which is a Continuation Application ofPCT Application No. PCT/JP2010/056558, filed Apr. 13, 2010 which claimspriority to Japanese Patent Application No. 2009-096634, filed Apr. 13,2009, all of which are incorporated herein by reference in theirentireties.

FIELD

Embodiments described herein relate generally to an armature windinghaving six parallel circuits applied to a 3-phase 2-pole 72-slotrotating electrical machine.

BACKGROUND

In a large-capacity rotating electrical machine, an armature winding isprovided with upper and lower coil pieces arranged in two layers inslots provided in a laminated iron core, and the parallel circuits areconnected in series, thereby increasing generated voltage and machinecapacity. However, as a voltage of an armature winding is increased, thethickness of the main insulation of an armature winding is increased towithstand such higher voltage. As a result, a cross-sectional area of aconducting portion is decreased, a current density is increased, and aloss is increased.

Particularly, in a machine using an indirect cooling system, as thethickness of a main insulating layer increases, a thermal resistanceincreases, and a temperature increases in an armature winding.Therefore, an armature winding is divided into multiple parallelcircuits, thereby decreasing the armature winding voltage and maininsulation thickness, reducing the loss, and increasing the coolingcapacity, while maintaining the machine capacity. Further, in anindirect-cooling large-capacity machine, it is common to increase thenumber of slots in an armature core to increase a cooling cycle of anarmature winding. Therefore, an armature winding having three or moreparallel circuits is required.

If an armature winding having three or more parallel circuits is appliedto a 2-pole machine, the voltages generated by the parallel circuits arenot completely equated, a circulation current is generated between theparallel circuits, and an armature winding loss is increased.

To decrease the loss by the circulation current, it is necessary tominimize the imbalance of the voltages generated by the parallelcircuits. For this purpose, special consideration is required toplacement of coils belonging to each parallel circuit in each phasebelt.

An example of improvement in placement of coils is explained withreference to a developed perspective view showing one phase of anarmature winding shown in FIG. 30.

FIG. 30 shows an example of an armature winding having four parallelcircuits applicable to a 3-phase 2-pole 72-slot rotating electricalmachine, based on the U.S. Pat. No. 2,778,962 (hereinafter, US patent ofHamilton D. Taylor).

FIG. 30 shows only one phase. For the other two phases, it is obviousthat the configuration of the shown phase of an armature winding isshifted by 120° and 240°.

In this patent, when parallel circuits are indicated by numbers 1 to 4,parallel circuits of twelve upper coil piece 15 a and lower coil piece16 a of a first phase belt 17 are numbered 1, 2, 2, 1, 2, 1, 1, 2, 1, 2,2, 1 sequentially from the center of a pole. Similarly, parallelcircuits of upper coil piece 15 b and lower coil piece 16 b of a secondphase belt 18 are numbered 3, 4, 4, 3, 4, 3, 3, 4, 3, 4, 4, 3sequentially from the center of a pole. This decreases a deviation ofvoltage (an absolute value of a deviation from an average phase voltage)and a deviation of phase (a deviation of phase angle from an averagephase voltage) of each parallel circuit.

To realize the above connection, in FIG. 30, fourteen jumper wires 20 aper phase are provided at the connection side coil end 19 a.

As for the voltage and phase angle deviations of each parallel circuit,the U.S. Pat. No. 2,778,963 (hereinafter, US patent of Rudolph HabermannJr.) is known.

In this patent, a voltage deviation of each parallel circuit is rated at0.4% or lower, and a phase angle deviation is rated at 0.15° or lower.Compared with the voltage deviation of 0.12% and phase angle deviationof 0° in the US patent of Hamilton D. Taylor, the values are highlybalanced, and sufficiently efficient to decrease a circulation current.

The connection method in the US patent of Hamilton D. Taylor provides anarmature winding having four parallel circuits applicable to a 3-phase2-pole 72-slot rotating electrical machine. In an indirect-coolinglarge-capacity rotating electrical machine, an armature winding havingmore parallel circuits is required.

The invention has been made considering the above circumstances. Theinvention may provide an armature winding having six parallel circuitsapplied to a large-capacity 3-phase 2-pole 72-slot rotating electricalmachine.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a first embodiment of thepresent invention;

FIG. 2 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a second embodiment of thepresent invention;

FIG. 3 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a third embodiment of thepresent invention;

FIG. 4 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fourth embodiment of thepresent invention;

FIG. 5 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fifth embodiment of thepresent invention;

FIG. 6 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a sixth embodiment of thepresent invention;

FIG. 7 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a seventh embodiment of thepresent invention;

FIG. 8 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in an eighth embodiment of thepresent invention;

FIG. 9 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a ninth embodiment of thepresent invention;

FIG. 10 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a tenth embodiment of thepresent invention;

FIG. 11 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in an eleventh embodiment ofthe present invention;

FIG. 12 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twelfth embodiment of thepresent invention;

FIG. 13 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a thirteenth embodiment ofthe present invention;

FIG. 14 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fourteenth embodiment ofthe present invention;

FIG. 15 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fifteenth embodiment ofthe present invention;

FIG. 16 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a sixteenth embodiment ofthe present invention;

FIG. 17 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a seventeenth embodiment ofthe present invention;

FIG. 18 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in an eighteenth embodiment ofthe present invention;

FIG. 19 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a nineteenth embodiment ofthe present invention;

FIG. 20 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twentieth embodiment ofthe present invention;

FIG. 21 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-first embodiment ofthe present invention;

FIG. 22 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-second embodimentof the present invention;

FIG. 23 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-third embodiment ofthe present invention;

FIG. 24 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-fourth embodimentof the present invention;

FIG. 25 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-fifth embodiment ofthe present invention;

FIG. 26 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-sixth embodiment ofthe present invention;

FIG. 27 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-seventh embodimentof the present invention;

FIG. 28 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-eighth embodimentof the present invention;

FIG. 29 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-ninth embodiment ofthe present invention; and

FIG. 30 is a developed perspective view showing one phase of an armaturewinding of a conventional rotating electrical machine.

DETAILED DESCRIPTION

Embodiments of the present invention will be described below withreference to the drawings. In general, according to the embodiments, anarmature winding of a rotating electrical machine may be provided usingmeans as described below.

(1) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece, connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper coil pieces of firstand fourth parallel circuits are placed at 3rd, 4th, 7th, and 12thpositions from the center of a pole, and lower coil pieces of the firstand fourth parallel circuits are placed at 1st, 6th, 9th, and 10thpositions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 8th, and 11thpositions from the center of a pole; and upper coil pieces of third andsix parallel circuits are placed at 1st, 6th, 9th, and 10th positionsfrom the center of a pole, and lower coil pieces of the third and sixparallel circuits are placed at 3rd, 4th, 7th, and 12th positions fromthe center of a pole, when relative positions of the upper and lowercoil pieces in one phase belt are indicated by positions countedsequentially from the center of a pole.

(2) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 8th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 3rd, 4th, 7th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 1st, 6th, 9th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(3) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 6th, 9th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 7th, and 8thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(4) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 3rd, 4th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 6th, 9th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 2nd, 5th, 7th, and 8thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(5) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 3rd, 4th, 8th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 7th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 1st, 6th, 9th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(6) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 8th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 3rd, 4th, 6th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 2nd, 5th, 7th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(7) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 8th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 7th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(8) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 9th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 7th, 8th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(9) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 10th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 7th, 8th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(10) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 10th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 3rd, 4th, 7th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 1st, 6th, 8th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(11) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 9th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 3rd, 4th, 7th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 1st, 6th, 8th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(12) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 10th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 6th, 9th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 7th, and 8thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(13) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 3rd, 4th, 11th and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 7th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 1st, 6th, 8th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(14) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 9th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 6th, 10th, and11th positions from the center of a pole; and upper and lower coilpieces of third and six parallel circuits are placed at 3rd, 4th, 7th,and 8th positions from the center of a pole, when relative positions ofthe upper and lower coil pieces in one phase belt are indicated bypositions counted sequentially from the center of a pole.

(15) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 3rd, 8th, 8th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 6th, 9th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 2nd, 5th, 7th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(16) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 3rd, 4th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 6th, 8th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 2nd, 5th, 7th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(17) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 3rd, 4th, 8th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 6th, 10th, and11th positions from the center of a pole; and upper and lower coilpieces of third and six parallel circuits are placed at 2nd, 5th, 7th,and 9th positions from the center of a pole, when relative positions ofthe upper and lower coil pieces in one phase belt are indicated bypositions counted sequentially from the center of a pole.

(18) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 3rd, 4th, 7th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 8th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 1st, 6th, 9th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(19) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 7th, 9th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 8th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(20) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end, and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 7th, 10th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 8th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(21) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 8th, 9th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 7th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(22) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 8th, 10th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 2nd, 5th, 7th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(23) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 9th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 3rd, 4th, 6th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 2nd, 5th, 7th, and 8thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(24) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 7th, 8th, and9th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 3rd, 4th, 6th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 2nd, 5th, 11th, and 12thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(25) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 1st, 10th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 3rd, 4th, 6th, and 9thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 2nd, 5th, 7th, and 8thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(26) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 8th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 7th, 9th, and 11thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 10thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(27) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 11th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 7th, 8th, and 10thpositions from the center of a pole; and upper and lower coil pieces ofthird and six parallel circuits are placed at 3rd, 4th, 6th, and 9thpositions from the center of a pole, when relative positions of theupper and lower coil pieces in one phase belt are indicated by positionscounted sequentially from the center of a pole.

(28) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper and lower coil piecesof first and fourth parallel circuits are placed at 2nd, 5th, 8th, and12th positions from the center of a pole; upper and lower coil pieces ofsecond and fifth parallel circuits are placed at 1st, 7th, 10th, and11th positions from the center of a pole; and upper and lower coilpieces of third and six parallel circuits are placed at 3rd, 4th, 6th,and 9th positions from the center of a pole, when relative positions ofthe upper and lower coil pieces in one phase belt are indicated bypositions counted sequentially from the center of a pole.

(29) There is provided a 3-phase 2-pole 2-layer armature winding of arotating electrical machine, housed in 72 slots provided in a laminatediron core, the winding for each phase comprising: six parallel circuitsseparated into two phase belts comprising first and second phase belts,each parallel circuit comprising two coil pieces, an upper coil pieceand a lower coil piece connected in series with each other at aconnection side coil end and at a non-connection side coil end; and theparallel circuits being connected such that upper coil pieces of firstand fourth parallel circuits are placed at 2nd, 5th, 7th, and 12thpositions from the center of a pole, and lower coil pieces of the firstand fourth parallel circuits are placed at 1st, 6th, 9th, and 10thpositions; upper coil pieces of second and fifth parallel circuits areplaced at 3rd, 4th, 8th, and 11th positions from the center of a pole,and lower coil pieces of the second and fifth parallel circuits areplaced at 3rd, 4th, 7th, and 12th positions from the center of a pole;and upper coil pieces of third and six parallel circuits are placed at1st, 6th, 9th, and 10th positions from the center of a pole, and lowercoil pieces of the third and six parallel circuits are placed at 2nd,5th, 8th, and 11th positions, when relative positions of the upper andlower coil pieces in one phase belt are indicated by positions countedsequentially from the center of a pole.

Embodiment 1

FIG. 1 is a developed perspective view showing a phase of an armaturewinding in a first embodiment the invention.

As shown in FIG. 1, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core, and a 2-pole 3-phase 6-parallel-circuit armaturewinding is housed in the slots 13 in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The first and second phase belts mentioned here means winding portions,which are obtained by dividing each of three phases into two andassigned, and form the same phase by housing the upper and lower coilsin two layers in the seventy-two slots provided in the laminated core(armature core), and sequentially connecting them in series.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing. The circuitnumbers are assigned to identify the parallel circuits for convenienceof explanation, and may be indicated by any symbol in any order.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

FIG. 1 shows an example in which a coil pitch is a small value of ⅔.This is for the purpose of making the drawing easy to comprehend. Thepitch is not limited to this value.

As shown in FIG. 1, eight jumper wires 20 a per phase are provided atthe connection side coil end 19 a of each phase 17 and 18. The circuitsof the upper coil piece 15 of the first phase belt 17 are numbered 3, 2,1, 1, 2, 3, 1, 2, 3, 3, 2, 1 sequentially from the pole center Pa side,and the circuits of the lower coil piece 16 are numbered 1, 2, 3, 3, 2,1, 3, 2, 1, 1, 2, 3 sequentially from the pole center Pa side. Thecircuits of the upper coil piece 15 of the second phase belt 18 arenumbered 6, 5, 4, 4, 5, 6, 4, 5, 6, 6, 5, 4 sequentially from the polecenter Pb side, and the circuits of the lower coil piece 16 are numbered4, 5, 6, 6, 5, 4, 6, 5, 4, 4, 5, 6 sequentially from the pole center Pbside.

Therefore, when the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thecenter of a pole, the upper and lower coil pieces of each parallelcircuit are placed as shown in Table 1.

TABLE 1 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 1, four upper coil pieces 15 of the first and fourthparallel circuits are placed at 3rd, 4th, 7th and 12th positions fromthe pole center, and four lower coil pieces 16 of the first and fourthparallel circuits are placed at 1st, 6th, 9th and 10th positions fromthe pole center. Four upper and lower coil pieces 15 and 16 of thesecond and fifth parallel circuits are placed at 2nd, 5th, 8th, and 11thpositions from the pole center. Four upper coil pieces 15 of the thirdand sixth parallel circuits are placed at 1st, 6th, 9th, and 10thpositions from the pole center, and four lower coil pieces 16 of thethird and sixth parallel circuits are placed at 3rd, 4th, 6th, 7th, and12th positions from the pole center.

Next, the imbalance of the voltages generated in one phase is explained.Here, the following definition is generally adopted as a means fornumerically evaluating the imbalance. The voltage expressed by p.u. ofonly one circuit of multiple parallel circuits in one phase is a ratioof the open voltage of that parallel circuit to an average voltage(phase voltage) as a whole phase, and indicates the degree of imbalanceof the voltages of that parallel circuit and whole phase. Similarly, aphase angle deviation of an open voltage generated in one parallelcircuit from a phase voltage indicates the degree of imbalance of thephase angles of the voltages of that parallel circuit and whole phase.

Table 2 shows the balance of the voltage generated in an armaturewinding in the first embodiment. In the first embodiment, this balancedoes not vary with a coil pitch. As shown in Table 2, in the armaturewinding in the first embodiment, a voltage deviation (a deviation of ap.u. voltage from 1.0) is 0.25% maximum, and a phase angle deviation is0.17°. Compared with the standard in the US patent of Rudolph HabermannJr., 0.4% in voltage deviation and 0.15° in phase angle, the phase angledeviation is a little higher, but the voltage deviation is small, andthe balance is high as a whole.

TABLE 2 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9987 1.00250.9987 0.9987 1.0025 0.9987 Voltage phase 0.177 0.000 −0.177 0.177 0.000−0.177 (degree)

As described above, in the first embodiment, the balance equivalent tothe standard in the US patent of Rudolph Habermann Jr. is realized forthe voltages of parallel circuits, and a circulation current can bedecreased.

In the first embodiment, the total number of jumper wires 20 a is 80 pera phase, which is decreased from 14 per phase in one phase of thearmature winding shown in FIG. 30. Therefore, the distance between thejumper wires 20 a is increased, and the workability for connectingjumper wires 20 a is improved, the insulation quality and fixingstrength at each connecting point are ensured, and the reliability ofthe armature winding is increased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 2

FIG. 2 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a second embodiment of thepresent invention.

As shown in FIG. 2, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

As shown in FIG. 2, four jumper wires 20 a per a phase are provided atthe connection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 h. when the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 3.

TABLE 3 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 3, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 8th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 3rd, 4th,7th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at1st, 6th, 9th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 3, 1, 2, 2, 1, 3, 2, 1, 3, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 6,9, 5, 5, 4, 6, 5, 4, 6, 6, 5, 4 sequentially from the pole center side.

Table 4 shows the balance of the voltage generated in an armaturewinding in the second embodiment. In the second embodiment, the balancevaries with a coil pitch. Table 9 shows a case where a winding pitch is30/36 (83.33%).

TABLE 4 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9984 1.00200.9996 0.9984 1.0020 0.9996 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 4, in the armature winding in the second embodiment, avoltage deviation (a deviation of a p.u. voltage from 1.0) is 0.20%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 5 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the second embodiment. In a practicalwinding pitch range of 31/36 or less, the balance meets the standard inthe US patent of Rudolph Habermann Jr., 0.4% in voltage deviation and0.15° in phase angle.

TABLE 5 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.15%0.04% 0.09% 0.20% 0.31% 0.42% deviation Phase angle 0.00° 0.00° 0.00°0.00° 0.00° 0.00° deviation

As described above, in the second embodiment, in the practical windingpitch range of 31/36 or less, the balance meeting the standard in the USpatent of Rudolph Habermann Jr. is realized with respect to the voltagesof parallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 3

FIG. 3 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a third embodiment of thepresent invention.

As shown in FIG. 3, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding 14 of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil and 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 3, eight jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and twelve jumperwires 20 b per phase belt are provided at the non-connection side coilend 19 b. When the relative positions of the upper and lower coil pieces15 and 16 in each phase belt are indicated by positions from the polecenter, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 6.

TABLE 6 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 6, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 1st, 6th,9th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 7th, and 8th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 2, 3, 3, 2, 2, 1, 1sequentially from the pole center side. The circuits second phase belt18 are numbered 5, 4, 6, 6, 4, 5, 6, 6, 5, 5, 4, 4 sequentially from thepole center side.

Table 7 shows the balance of the voltage generated in an armaturewinding in the third embodiment. In the embodiment, the balance varieswith a coil pitch. Table 7 shows a case where a winding pitch is 30/36(83.33%).

TABLE 7 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9984 0.99961.0020 0.9984 0.9996 1.0020 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 7, in the armature winding in the third embodiment, avoltage deviation (a deviation of a p.u. voltage from 1.0) is 0.20%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 8 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the third embodiment. When a windingpitch is 30/36 or 31/36, the balance meets the standard in the US patentof Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° in phaseangle.

TABLE B Coil pitch 28/36 29/36 30/36 31/36 Voltage 0.68% 0.25% 0.20%0.62% deviation Phase angle 0.00° 0.00° 0.00° 0.00° deviation

As described above, in the third embodiment, when a winding pitch is30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 4

FIG. 4 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fourth embodiment of thepresent invention.

As shown in FIG. 4, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 4, eight jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and eight jumperwires 20 b per phase belt are provided at the non-connection side coilend 19 b. When the relative positions of the upper and lower coil pieces15 and 16 in each phase belt are indicated by positions from the polecenter, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 9.

TABLE 9 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 9, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 3rd, 4th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 1st, 6th,9th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at2nd, 5th, 7th, and 8th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 3, 1, 1, 3, 2, 3, 3, 2, 2, 1, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,6, 4, 4, 6, 5, 6, 6, 5, 5, 4, 4 sequentially from the pole center side.

Table 10 shows the balance of the voltage generated in an armaturewinding in the fourth embodiment. In the embodiment, the balance varieswith a coil pitch. Table 10 shows a case where a winding pitch is 30/36(83.33%).

TABLE 10 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0020 0.99960.9984 1.0020 0.9996 0.9984 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 10, in the armature winding in the fourth embodiment,a voltage deviation (a deviation of a p.u. voltage from 1.0) is 0.20%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 11 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the fourth embodiment. When a windingpitch is 29/36 or 30/36, the balance meets the standard in the US patentof Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° in thephase angle.

TABLE 11 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.61%0.20% 0.25% 0.66% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the fourth embodiment, when a winding pitch is29/36 or 30/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 5

FIG. 5 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fifth embodiment of thepresent invention.

As shown in FIG. 5, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-cut portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 5, eight jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and eighteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 12.

TABLE 12 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 12, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 3rd, 4th, 8th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 2nd, 5th,7th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at1st, 6th, 9th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 3, 2, 1, 1, 2, 3, 2, 1, 3, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 6,5, 4, 4, 5, 6, 5, 4, 6, 6, 5, 4 sequentially from the pole center side.

Table 13 shows the balance of the voltage generated in an armaturewinding in the fifth embodiment. In the embodiment, the balance varieswith a coil pitch. Table 13 shows a case where a winding pitch is 30/36(83.33%).

TABLE 13 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0020 0.99840.9996 1.0020 0.9984 0.9996 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 13, in the armature winding in the fifth embodiment, avoltage deviation (a deviation of a p.u. voltage from 1.0) is 0.20%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 14 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the fifth embodiment. In a windingpitch range of 28/36 to 35/36 including the ones not shown in the table,the balance meets the standard in the US patent of Rudolph HabermannJr., 0.4% in voltage deviation and 0.15° in phase angle.

TABLE 14 Coil pitch 27/36 28/36 29/36 30/36 33/36 35/36 Voltage 0.49%0.39% 0.29% 0.20% 0.15% 0.35% deviation Phase angle 0.00° 0.00° 0.00°0.00° 0.00° 0.00° deviation

As described above, in the fifth embodiment, when a winding pitch is28/36 to 35/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 6

FIG. 6 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a sixth embodiment of thepresent invention.

As shown in FIG. 6, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 6, six jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 15.

TABLE 15 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 Parallel Uppercoil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1circuits 2 and 5 Lower coil piece 1 Parallel Upper coil piece 1 1circuits 3 and 6 Lower coil piece 1 1

As shown in Table 15, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 8th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 3rd, 4th,6th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at2nd, 5th, 7th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 3, 2, 2, 3, 2, 3, 1, 3, 2, 1, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 4,6, 5, 5, 6, 5, 6, 4, 6, 5, 4, 4 sequentially from the pole center side.

Table 16 shows the balance of the voltage generated in an armaturewinding in the sixth embodiment. In the embodiment, the balance varieswith a coil pitch. Table 16 shows a case where a winding pitch is 30/36(83.33%).

TABLE 16 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0015 0.99791.0005 1.0015 0.9979 1.0005 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 16, in the armature winding in the sixth embodiment, avoltage deviation (a deviation of a p.u. voltage from 1.0) is 0.21%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 17 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the sixth embodiment. Only when awinding pitch is 30/36 does the balance meet the standard in the USpatent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° inphase angle.

TABLE 17 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.79%0.21% 0.47% deviation Phase angle 0.00° 0.00° 0.00° deviation

As described above, in the sixth embodiment, when a winding pitch is30/36, the balance meeting the standard in the US patent of RudolphHabermann Jr. is realized with respect to the voltages of parallelcircuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 7

FIG. 7 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a seventh embodiment of thepresent invention.

As shown in FIG. 7, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 7, two jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and twelve jumperwires 20 b per phase belt are provided at the non-connection side coilend 19 b. When the relative positions of the upper and lower coil pieces15 and 16 in each phase belt are indicated by positions from the polecenter, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 18.

TABLE 18 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1 1circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coil piece 1circuits 3 and 6 Lower coil piece 1

As shown in Table 18, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 8th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 2nd, 5th,7th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 2, 3, 3, 2, 3, 2, 1, 3, 2, 1, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 4,5, 6, 6, 5, 6, 5, 4, 6, 5, 4, 4 sequentially from the pole center side.

Table 19 shows the balance of the voltage generated in an armaturewinding in the seventh embodiment. In the embodiment, the balance varieswith a coil pitch. Table 19 shows a case where a winding pitch is 30/36(83.33%).

TABLE 19 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0015 1.00050.9979 1.0015 1.0005 0.9979 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 19, in the armature winding in the seventh embodiment,a voltage deviation (a deviation of a p.u. voltage from 1.0) is 0.21%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 20 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the seventh embodiment. Only when awinding pitch is 30/36 does the balance meet the standard in the USpatent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° inphase angle.

TABLE 20 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.79%0.21% 0.47% deviation Phase angle 0.00° 0.00° 0.00° deviation

As described above, in the seventh embodiment, when a winding pitch is30/36, the balance meeting the standard in the US patent of RudolphHabermann Jr. is realized with respect to the voltages of parallelcircuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 8

FIG. 8 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in an eighth embodiment of thepresent invention.

As shown in FIG. 8, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 8, eight jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 21.

Relative positions from the center of pole 1 2 3 4 5 6 Parallel Uppercoil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 circuits 2 and 5 Lower coil piece 1 Parallel Upper coil piece 11 1 circuits 3 and 6 Lower coil piece 1 1 1 Relative positions from thecenter of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 circuits 1and 4 Lower coil piece 1 1 Parallel Upper coil piece 1 1 1 circuits 2and 5 Lower coil piece 1 1 1 Parallel Upper coil piece 1 circuits 3 and6 Lower coil piece 1

As shown in Table 21, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 9th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 1st, 7th,8th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 3, 2, 2, 1, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,4, 6, 6, 4, 6, 5, 5, 4, 6, 5, 4 sequentially from the pole center side.

Table 22 shows the balance of the voltage generated in an armaturewinding in the eight embodiment. In the embodiment, the balance varieswith a coil pitch. Table 22 shows a case where a winding pitch is 30/36(83.33%).

TABLE 22 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0005 1.00150.9979 1.0005 1.0015 0.9979 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 22, in the armature winding in the eighth embodiment,a voltage deviation (a deviation of a p.u. voltage from 1.0) is 0.21%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 23 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the eighth embodiment. When a windingpitch is 30/36 or 31/36, the balance meets the standard in the US patentof Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° in phaseangle.

TABLE 23 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.53%0.21% 0.15% 0.42% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the eighth embodiment, when a winding pitch is30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 9

FIG. 9 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a ninth embodiment of thepresent invention.

As shown in FIG. 9, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 9, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 24.

TABLE 24 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 circuits 2 and 5 Lower coil piece 1 Parallel Uppercoil piece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 Parallel Upper coilpiece 1 circuits 3 and 6 Lower coil piece 1

As shown in Table 24, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 10th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 1st, 7th,8th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 3, 2, 2, 3, 1, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,4, 6, 6, 4, 6, 5, 5, 6, 4, 5, 4 sequentially from the pole center side.

Table 25 shows the balance of the voltage generated in an armaturewinding in the ninth embodiment. In the embodiment, the balance varieswith a coil pitch. Table 25 shows a case where a winding pitch is 30/36(83.33%).

TABLE 25 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0005 1.00150.9979 1.0005 1.0015 0.9979 Voltage phase 0.000 0.000 0.000 0.000 0.0000.000 (degree)

As shown in Table 25, in the armature winding in the ninth embodiment, avoltage deviation (a deviation of a p.u. voltage from 1.0) is 0.21%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 26 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the ninth embodiment. When a windingpitch is 30/36 or 31/36, the balance meets the standard in the US patentof Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° in phaseangle.

TABLE 26 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.63%0.21% 0.25% 0.62% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the ninth embodiment, when a winding pitch is30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 10

FIG. 10 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a tenth embodiment of thepresent invention.

As shown in FIG. 10, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase six parallel circuits. The parallelcircuits are given numbers {circle around (1)}, {circle around (2)},{circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 10, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 27.

TABLE 27 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 27, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 10th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 3rd, 4th,7th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at1st, 6th, 8th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 3, 1, 2, 2, 1, 3, 2, 3, 3, 1, 2, 1sequentially from the pole center side. The circuits of the upper andlower coin pieces 15 and 16 in the second phase belt 18 are numbered 6,4, 5, 5, 4, 6, 5, 6, 6, 4, 5, 4 sequentially from the pole center side.

Table 28 shows the balance of the voltage generated in an armaturewinding in the tenth embodiment. In the embodiment, the balance varieswith a coil pitch. Table 28 shows a case where a winding pitch is 30/36(83.33%).

TABLE 28 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0005 1.00200.9975 1.0005 1.0020 0.9975 Voltage phase (degree) 0.000 0.000 0.0000.000 0.000 0.000

As shown in Table 28, in the armature winding in the tenth embodiment, avoltage deviation (a deviation of a p.u. voltage from 1.0) is 0.25%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 29 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the tenth embodiment. When a windingpitch is 30/36 or 31/36, the balance meets the standard in the US patentof Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° in phaseangle.

TABLE 29 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.45%0.25% 0.31% 0.55% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the tenth embodiment, when a winding pitch is30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 11

FIG. 11 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in an eleventh embodiment ofthe present invention.

As shown in FIG. 11, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 11, two jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and eighteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 30.

TABLE 30 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 30, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 9th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 3rd, 4th,7th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at1st, 6th, 8th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 3, 1, 2, 2, 1, 3, 2, 3, 1, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 6,4, 5, 5, 4, 6, 5, 6, 4, 6, 5, 4 sequentially from the pole center side.

Table 31 shows the balance of the voltage generated in an armaturewinding in the eleventh embodiment. In the embodiment, the balancevaries with a coil pitch. Table 2B shows a case where a winding pitch is30/36 (83.33%).

TABLE 31 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0005 1.00200.9975 1.0005 1.0020 0.9975 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 31, in the armature winding in the eleventhembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 32 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the eleventh embodiment. When awinding pitch is in a range of 29/36 to 31/36, the balance meets thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle.

TABLE 32 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.46%0.34% 0.25% 0.31% 0.42% deviation Phase angle 0.00° 0.00° 0.00° 0.00°0.00° deviation

As described above, in the eleventh embodiment, when a winding pitch isin a range of 29/36 to 31/36, the balance meeting the standard in the USpatent of Rudolph Habermann Jr. is realized with respect to the voltagesof parallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 12

FIG. 12 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twelfth embodiment of thepresent invention.

As shown in FIG. 12, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 12, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 33.

TABLE 33 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 33, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 10th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 1st, 6th,9th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 7th, and 8th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 2, 3, 3, 2, 1, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,4, 6, 6, 4, 5, 6, 6, 5, 4, 5, 4 sequentially from the pole center side.

Table 34 shows the balance of the voltage generated in an armaturewinding in the twelfth embodiment. In the embodiment, the balance varieswith a coil pitch. Table 34 shows a case where a winding pitch is 30/36(83.33%).

TABLE 34 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0005 0.99751.0020 1.0005 0.9975 1.0020 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 34, in the armature winding in the twelfth embodiment,a voltage deviation (a deviation of a p.u. voltage from 1.0) is 0.25%maximum, and a phase angle deviation is 0.00°. These values meet thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle, and the voltage balance higher thanthat in the first embodiment is realized.

Table 35 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twelfth embodiment. When a windingpitch is 29/36 or 30/36, the balance meets the standard in the US patentof Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° in phaseangle.

TABLE 35 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.67%0.36% 0.25% 0.62% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the twelfth embodiment, when a winding pitch is29/36 or 30/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 13

FIG. 13 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a thirteenth embodiment ofthe present invention.

As shown in FIG. 13, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil and 19 a, thereby forming thearmature winding.

In FIG. 13, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and twenty jumperwires 20 b per phase belt are provided at the non-connection side coilend 19 b. When the relative positions of the upper and lower coil pieces15 and 16 in each phase belt are indicated by positions from the polecenter, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 36.

TABLE 36 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 36, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 3rd, 4th 11th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 2nd, 5th,7th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 8th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 3, 2, 1, 1, 2, 3, 2, 3, 3, 2, 1, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 6,5, 4, 4, 5, 6, 5, 6, 6, 5, 4, 4 sequentially from the pole center side.

Table 37 shows the balance of the voltage generated in an armaturewinding in the thirteenth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 37 shows a case where a winding pitch is30/36 (83.33%).

TABLE 37 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0020 1.00050.9975 1.0020 1.0005 0.9975 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 37, in the armature winding in the thirteenthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 38 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the thirteenth embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 38 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.61%0.25% 0.25% 0.58% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the thirteenth embodiment, when a winding pitchis 30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 14

FIG. 14 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fourteenth embodiment ofthe present invention.

As shown in FIG. 14, an armature 11 of a rotating electrical machine hasseventy-two slots 13 in an armature core 12 comprising a laminated ironcore. In the slots 13, a 2-pole 3-phase 6-parallel-circuit armaturewinding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 14, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 39.

TABLE 39 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 39, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 9th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 1st, 6th,10th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 7th, and 8th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 2, 3, 3, 1, 2, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,4, 6, 6, 4, 5, 6, 6, 4, 5, 5, 4 sequentially from the pole center side.

Table 40 shows the balance of the voltage generated in an armaturewinding in the fourteenth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 40 shows a case where a winding pitch is30/36 (83.33%).

TABLE 40 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0005 0.99751.0020 1.0005 0.9975 1.0020 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 40, in the armature winding in the fourteenthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 41 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the fourteenth embodiment. When awinding pitch is 29/36 or 30/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 41 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.66%0.25% 0.25% 0.62% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the fourteenth embodiment, when a winding pitchis 29/36 or 30/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 15

FIG. 15 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a fifteenth embodiment ofthe present invention.

As shown in FIG. 15, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 15, twelve jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and eight jumperwires 20 b per phase belt are provided at the non-connection side coilend 19 b. When the relative positions of the upper and lower coil pieces15 and 16 in each phase belt are indicated by positions from the polecenter, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 42.

TABLE 42 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 42, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 3rd, 4th, 8th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 1st, 6th,9th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at2nd, 5th, 7th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 3, 1, 1, 3, 2, 3, 1, 2, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,6, 4, 4, 6, 5, 6, 4, 5, 6, 5, 4 sequentially from the pole center side.

Table 43 shows the balance of the voltage generated in an armaturewinding in the fifteenth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 43 shows a case where a winding pitch is30/36 (83.33%).

TABLE 43 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0020 0.99751.0005 1.0020 0.9975 1.0005 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 43, in the armature winding in the fifteenthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 44 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the fifteenth embodiment. When awinding pitch is in a range of 28/36 to 31/36, the balance meets thestandard in the US patent of Rudolph Habermann Jr., 0.4% in voltagedeviation and 0.15° in phase angle.

TABLE 44 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.60%0.39% 0.29% 0.25% 0.36% 0.48% deviation Phase angle 0.00° 0.00° 0.00°0.00° 0.00° 0.00° deviation

As described above, in the fifteenth embodiment, when a winding pitch isin a range of 28/36 to 31/36, the balance meeting the standard in the USpatent of Rudolph Habermann Jr. is realized with respect to the voltagesof parallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 16

FIG. 16 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a sixteenth embodiment ofthe present invention.

As shown in FIG. 16, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 16, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and eighteenjumper wires 20 b per a phase belt are provided at the non-connectionside coil end 19 b. When the relative positions of the upper and lowercoil pieces 15 and 16 in each phase belt are indicated by positions fromthe pole center, the upper and lower coil pieces 15 and 16 of eachparallel circuit are placed as shown in Table 45.

TABLE 45 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 45, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 3rd, 4th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 1st, 6th,8th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at2nd, 5th, 7th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 3, 1, 1, 3, 2, 3, 2, 3, 2, 1, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,6, 4, 4, 6, 5, 6, 5, 6, 5, 4, 4 sequentially from the pole center side.

Table 46 shows the balance of the voltage generated in an armaturewinding in the sixteenth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 46 shows a case where a winding pitch is30/36 (83.33%).

TABLE 46 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0020 0.99751.0005 1.0020 0.9975 1.0005 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 46, in the armature winding in the sixteenthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 47 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the sixteenth embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 47 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.61%0.25% 0.36% 0.66% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the sixteenth embodiment, when a winding pitch is30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 17

FIG. 17 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a seventeenth embodiment ofthe present invention.

As shown in FIG. 17, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil and 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 17, six jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 48.

TABLE 48 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 48, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 3rd, 4th, 8th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 1st, 6th,10th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at2nd, 5th, 7th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 3, 1, 1, 3, 2, 3, 1, 3, 2, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,6, 4, 4, 6, 5, 6, 4, 6, 5, 5, 4 sequentially from the pole center side.

Table 49 shows the balance of the voltage generated in an armaturewinding in the seventeenth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 49 shows a case where a winding pitch is30/36 (83.33%).

TABLE 49 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0020 0.99751.0005 1.0020 0.9975 1.0005 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 49, in the armature winding in the seventeenthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 50 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the seventeenth embodiment. When awinding pitch is 29/36 or 30/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 50 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.59%0.29% 0.25% 0.47% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the seventeenth embodiment, when a winding pitchis 29/36 or 30/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 18

FIG. 18 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in an eighteenth embodiment ofthe present invention.

As shown in FIG. 18, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 18, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 51.

TABLE 51 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 51, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 3rd, 4th, 7th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 2nd, 5th,8th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at1st, 6th, 9th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 3, 2, 1, 1, 2, 3, 1, 2, 3, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 6,5, 4, 4, 5, 6, 4, 5, 6, 6, 5, 4 sequentially from the pole center side.

Table 52 shows the balance of the voltage generated in an armaturewinding in the eighteenth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 52 shows a case where a winding pitch is30/36 (83.33%).

TABLE 52 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9979 1.00250.9996 0.9979 1.0025 0.9996 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 52, in the armature winding in the eighteenthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 53 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the eighteenth embodiment. In apractical winding pitch range including those not shown in the table,the balance meets the standard in the US patent of Rudolph HabermannJr., 0.4% in voltage deviation and 0.15° in phase angle.

TABLE 53 Coil pitch 25/36 28/36 30/36 31/36 32/36 35/36 Voltage 0.29%0.25% 0.25% 0.25% 0.25% 0.25% deviation Phase angle 0.00° 0.00° 0.00°0.00° 0.00° 0.00° deviation

As described above, in the eighteenth embodiment, in the practicalwinding pitch range, the balance meeting the standard in the US patentof Rudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 19

FIG. 19 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a nineteenth embodiment ofthe present invention.

As shown in FIG. 19, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 19, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and ten jumperwires 20 b per phase belt are provided at the non-connection side coilend 19 b. When the relative positions of the upper and lower coil pieces15 and 16 in each phase belt are indicated by positions from the polecenter, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 54.

TABLE 54 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1 1circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coil piece 1circuits 3 and 6 Lower coil piece 1

As shown in Table 54, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 7th, 9th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 2nd, 5th,8th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 2, 3, 3, 2, 3, 1, 2, 1, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 4,5, 6, 6, 5, 6, 4, 5, 4, 6, 5, 4 sequentially from the pole center side.

Table 55 shows the balance of the voltage generated in an armaturewinding in the nineteenth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 55 shows a case where a winding pitch is30/36 (83.33%).

TABLE 55 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9995 1.00250.9979 0.9995 1.0025 0.9979 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 55, in the armature winding in the nineteenthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 56 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the nineteenth embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 56 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.53%0.25% 0.36% 0.42% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the nineteenth embodiment, when a winding pitchis 30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 20

FIG. 20 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twentieth embodiment ofthe present invention.

As shown in FIG. 20, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 20, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 57.

TABLE 57 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1 1circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coil piece 1circuits 3 and 6 Lower coil piece 1

As shown in Table 57, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 7th, 10th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 2nd, 5th,8th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 2, 3, 3, 2, 3, 1, 2, 3, 1, 2, 1sequentially from the pole center side. The circuits second phase belt18 are numbered 4, 5, 6, 6, 5, 6, 4, 5, 6, 4, 5, 4 sequentially from thepole center side.

Table 58 shows the balance of the voltage generated in an armaturewinding in the twentieth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 55 shows a case where a winding pitch is30/36 (83.33%).

TABLE 58 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9995 1.00250.9979 0.9995 1.0025 0.9979 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 58, in the armature winding in the twentiethembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.25% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 59 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twentieth embodiment. Only when awinding pitch is 30/36 does the balance meet the standard in the USpatent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° inphase angle.

TABLE 59 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.63%0.25% 0.47% deviation Phase angle 0.00° 0.00° 0.00° deviation

As described above, in the twentieth embodiment, only when a windingpitch is 30/36 is the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 21

FIG. 21 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-first embodiment ofthe present invention.

As shown in FIG. 21, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 21, eight jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 60.

TABLE 60 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1 1circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coil piece 1circuits 3 and 6 Lower coil piece 1

As shown in Table 60, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 8th, 9th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 2nd, 5th,7th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 2, 3, 3, 2, 3, 2, 1, 1, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 4,5, 6, 6, 5, 6, 5, 4, 4, 6, 5, 4 sequentially from the pole center side.

Table 61 shows the balance of the voltage generated in an armaturewinding in the twenty-first embodiment. In the embodiment, the balancevaries with a coil pitch. Table 55 shows a case where a winding pitch is30/36 (83.33%).

TABLE 61 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0036 0.99840.9979 1.0036 0.9984 0.9979 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 61, in the armature winding in the twenty-firstembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 62 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-first embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 62 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.79%0.36% 0.11% 0.47% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the twenty-first embodiment, when a winding pitchis 30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 22

FIG. 22 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-second embodimentof the present invention.

As shown in FIG. 22, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 22, six jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 63.

TABLE 63 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1 1circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coil piece 1circuits 3 and 6 Lower coil piece 1

As shown in Table 63, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 8th, 10th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 2nd, 5th,7th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 2, 3, 3, 2, 3, 2, 1, 3, 1, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 4,5, 6, 6, 5, 6, 5, 4, 6, 4, 5, 4 sequentially from the pole center side.

Table 64 shows the balance of the voltage generated in an armaturewinding in the twenty-second embodiment. In the embodiment, the balancevaries with a coil pitch. Table 64 shows a case where a winding pitch is30/36 (83.33%).

TABLE 64 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0036 0.99840.9979 1.0036 0.9984 0.9979 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 64, in the armature winding in the twenty-secondembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 65 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-second embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 65 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.90%0.36% 0.21% 0.67% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the twenty-second embodiment, when the windingpitch is 30/36 or 31/36, the balance meeting the standard in the USpatent of Rudolph Habermann Jr. is realized with respect to the voltagesof parallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 23

FIG. 23 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-third embodiment ofthe present invention.

As shown in FIG. 23, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 23, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 66.

TABLE 66 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 Parallel Uppercoil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1circuits 2 and 5 Lower coil piece 1 Parallel Upper coil piece 1 1circuits 3 and 6 Lower coil piece 1 1

As shown in Table 66, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 9th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 3rd, 4th,6th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at2nd, 5th, 7th, and 8th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 3, 2, 2, 3, 2, 3, 3, 1, 2, 1, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 4,6, 5, 5, 6, 5, 6, 6, 4, 5, 4, 4 sequentially from the pole center side.

Table 67 shows the balance of the voltage generated in an armaturewinding in the twenty-third embodiment. In the embodiment, the balancevaries with a coil pitch. Table 67 shows a case where a winding pitch is30/36 (83.33%).

TABLE 67 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0036 0.99790.9984 1.0036 0.9979 0.9984 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 67, in the armature winding in the twenty-thirdembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 68 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-third embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 68 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 1.10%0.36% 0.36% 1.10% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the twenty-third embodiment, when a winding pitchis 30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 24

FIG. 24 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-fourth embodimentof the present invention.

As shown in FIG. 24, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 24, eight jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 69.

TABLE 69 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 ParallelUpper coil piece 1 circuits 3 and 6 Lower coil piece 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 circuits 2 and 5 Lower coil piece 1 Parallel Upper coil piece 11 1 circuits 3 and 6 Lower coil piece 1 1 1

As shown in Table 69, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 3rd, 4th,6th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at1st, 7th, 8th and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 3, 1, 2, 2, 1, 2, 3, 3, 3, 2, 1, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 6,4, 5, 5, 4, 5, 6, 6, 6, 5, 4, 4 sequentially from the pole center side.

Table 70 shows the balance of the voltage generated in an armaturewinding in the twenty-fourth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 70 shows a case where a winding pitch is30/36 (83.33%).

TABLE 70 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9984 0.99791.0036 0.9984 0.9979 1.0036 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 70, in the armature winding in the twenty-fourthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 71 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-fourth embodiment. Onlywhen a winding pitch is 30/36 does the balance meet the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 71 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.53%0.36% 0.56% deviation Phase angle 0.00° 0.00° 0.00° deviation

As described above, in the twenty-fourth embodiment, only when a windingpitch is 30/36 is the balance meeting the standard in the US patent ofRudolph Habermann Jr. realized with respect to the voltages of parallelcircuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 25

FIG. 25 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-fifth embodiment ofthe present invention.

As shown in FIG. 25, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 25, six jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 72.

TABLE 72 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 circuits 1 and 4 Lower coil piece 1 Parallel Uppercoil piece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 Parallel Uppercoil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relative positionsfrom the center of pole 7 8 9 10 11 12 Parallel Upper coil piece 1 1 1circuits 1 and 4 Lower coil piece 1 1 1 Parallel Upper coil piece 1circuits 2 and 5 Lower coil piece 1 Parallel Upper coil piece 1 1circuits 3 and 6 Lower coil piece 1 1

As shown in Table 72, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 1st, 10th, 11th, and12th positions from the pole center. Four upper and lower coil pieces 15and 16 of the second and fifth parallel circuits are placed at 3rd, 4th,6th, and 9th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at2nd, 5th, 7th, and 8th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 1, 3, 2, 2, 3, 2, 3, 3, 2, 1, 1, 1sequentially from the pole center side. The circuits second phase belt18 are numbered 4, 6, 5, 5, 6, 5, 6, 6, 5, 4, 4, 4 sequentially from thepole center side.

Table 73 shows the balance of the voltage generated in an armaturewinding in the twenty-fifth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 73 shows a case where a winding pitch is30/36 (83.33%).

TABLE 73 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 1.0036 0.99790.9984 1.0036 0.9979 0.9984 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 73, in the armature winding in the twenty-fifthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 74 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-fifth embodiment. Only whena winding pitch is 30/36 does the balance meet the standard in the USpatent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15° inphase angle.

TABLE 74 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 1.21%0.36% 0.47% deviation Phase angle 0.00° 0.00° 0.00° deviation

As described above, in the twenty-fifth embodiment, only when a windingpitch is 30/36 is the balance meeting the standard in the US patent ofRudolph Habermann Jr. realized with respect to the voltages of parallelcircuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 26

FIG. 26 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-sixth embodiment ofthe present invention.

As shown in FIG. 26, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 26, four jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and fourteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 75.

TABLE 75 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 circuits 2 and 5 Lower coil piece 1 Parallel Uppercoil piece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 Parallel Upper coilpiece 1 circuits 3 and 6 Lower coil piece 1

As shown in Table 75, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 8th, and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 1st, 7th,9th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 10th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 3, 2, 1, 2, 3, 2, 1sequentially from the pole center side. The circuits of the upper andlower coil pieces 15 and 16 in the second phase belt 18 are numbered 5,4, 6, 6, 4, 6, 5, 4, 5, 6, 5, 4 sequentially from the pole center side.

Table 76 shows the balance of the voltage generated in an armaturewinding in the twenty-sixth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 76 shows a case where a winding pitch is30/36 (83.33%).

TABLE 76 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9984 1.00360.9979 0.9984 1.0036 0.9979 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 76, in the armature winding in the twenty-sixthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 77 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-sixth embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 77 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.59%0.36% 0.25% 0.42% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the twenty-sixth embodiment, when a winding pitchis 30/36 or 31/36, the balance meeting the standard in the US patent ofRudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 27

FIG. 27 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-seventh embodimentof the present invention.

As shown in FIG. 27, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 27, ten jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and eighteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 78.

TABLE 78 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 circuits 2 and 5 Lower coil piece 1 Parallel Uppercoil piece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 Parallel Upper coilpiece 1 circuits 3 and 6 Lower coil piece 1

As shown in Table 78, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 11th and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 1st, 7th,8th, and 10th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 3, 2, 2, 3, 2, 1, 1sequentially from the pole center side. The circuits second phase belt18 are numbered 5, 4, 6, 6, 4, 6, 5, 5, 6, 5, 4, 4 sequentially from thepole center side.

Table 79 shows the balance of the voltage generated in an armaturewinding in the twenty-seventh embodiment. In the embodiment, the balancevaries with a coil pitch. Table 73 shows a case where a winding pitch is30/36 (83.33%).

TABLE 79 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9984 1.00360.9979 0.9984 1.0036 0.9979 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 79, in the armature winding in the twenty-seventhembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 80 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-seventh embodiment. Onlywhen a winding pitch is 30/36 does the balance meet the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 80 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.63%0.36% 0.56% deviation Phase angle 0.00° 0.00° 0.00° deviation

As described above, in the twenty-seventh embodiment, only when thewinding pitch is 30/36 is the balance meeting the standard in the USpatent of Rudolph Habermann Jr. realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 28

FIG. 28 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-eighth embodimentof the present invention.

As shown in FIG. 28, an armature 11 of a rotating electrical machine isprovided with seventy-two slots 13 in an armature core 12 comprising alaminated iron core. In the slots 13, a 2-pole 3-phase6-parallel-circuit armature winding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 28, eight jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 81.

TABLE 81 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 circuits 2 and 5 Lower coil piece 1 Parallel Uppercoil piece 1 1 1 circuits 3 and 6 Lower coil piece 1 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 1 circuits 2 and 5 Lower coil piece 1 1 1 Parallel Upper coilpiece 1 circuits 3 and 6 Lower coil piece 1

As shown in Table 81, four upper and lower coil pieces 15 and 16 of thefirst and fourth parallel circuits are placed at 2nd, 5th, 8th and 12thpositions from the pole center. Four upper and lower coil pieces 15 and16 of the second and fifth parallel circuits are placed at 1st, 7th,10th, and 11th positions from the pole center. Four upper and lower coilpieces 15 and 16 of the third and sixth parallel circuits are placed at3rd, 4th, 6th, and 9th positions from the pole center.

Therefore, the circuits of the upper and lower coil pieces 15 and 16 inthe first phase belt 17 are numbered 2, 1, 3, 3, 1, 3, 2, 1, 3, 2, 2, 1sequentially from the pole center side. The circuits second phase belt18 are numbered 5, 4, 6, 6, 4, 6, 5, 4, 6, 5, 5, 4 sequentially from thepole center side.

Table 82 shows the balance of the voltage generated in an armaturewinding in the twenty-eighth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 73 shows a case where a winding pitch is30/36 (83.33%).

TABLE 82 Parallel circuit 1 2 3 4 5 6 Voltage (p. u.) 0.9984 1.00360.9979 0.9984 1.0036 0.9979 Voltage phase 0.000  0.000  0.000  0.000 0.000  0.000  (degree)

As shown in Table 82, in the armature winding in the twenty-eighthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.36% maximum, and a phase angle deviation is 0.00°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 83 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-eighth embodiment. When awinding pitch is 30/36 or 31/36, the balance meets the standard in theUS patent of Rudolph Habermann Jr., 0.4% in voltage deviation and 0.15°in phase angle.

TABLE 83 Coil pitch 27/36 28/36 29/36 30/36 31/36 32/36 Voltage 0.69%0.36% 0.25% 0.62% deviation Phase angle 0.00° 0.00° 0.00° 0.00°deviation

As described above, in the twenty-eighth embodiment, when a windingpitch is 30/36 or 31/36, the balance meeting the standard in the USpatent of Rudolph Habermann Jr. is realized with respect to the voltagesof parallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

Embodiment 29

FIG. 29 is a developed perspective view showing one phase of an armaturewinding of a rotating electrical machine in a twenty-ninth embodiment ofthe present invention.

As shown in FIG. 29, an armature 11 of a rotating electrical machine hasseventy-two slots 13 in an armature core 12 comprising a laminated ironcore. In the slots 13, a 2-pole 3-phase 6-parallel-circuit armaturewinding is housed in two layers.

An armature winding of each phase has an upper coil piece 15 housed inthe upper part of the slot, and a lower coil piece 16 housed in thelower part of the slot. The ends of the upper and lower coil pieces 15and 16 are connected in series at a connection side coil end 19 aconnected to a lead-out portion of the winding, and at a non-connectionside coil end 19 b located axially opposite to the connection side coilend and not connected to a lead-out portion of the winding.

Further, the armature winding has a first phase belt 17 in which theupper and lower coil pieces 15 and 16 are housed in twelve slots 13provided in the armature core 12, and a second phase belt 18 in whichthe upper and lower coil pieces 15 and 16 are housed in the twelve slots13.

The armature winding of each phase has six parallel circuits. Theparallel circuits are given numbers {circle around (1)}, {circle around(2)}, {circle around (3)}, {circle around (4)}, {circle around (5)} and{circle around (6)} for identification in the drawing.

In each phase belt 17 and 18, the upper coil piece 15 is connected tothe corresponding lower coil piece 16 apart by a fixed pitch, at theconnection side coil end 19 a and non-connection side coil end 19 b,thereby forming six parallel circuits. The parallel circuits areconnected in parallel through the lead-out connection conductor 21provided at the connection side coil end 19 a, thereby forming thearmature winding.

In FIG. 29, six jumper wires 20 a per phase are provided at theconnection side coil end 19 a of each phase 17 and 18, and sixteenjumper wires 20 b per phase belt are provided at the non-connection sidecoil end 19 b. When the relative positions of the upper and lower coilpieces 15 and 16 in each phase belt are indicated by positions from thepole center, the upper and lower coil pieces 15 and 16 of each parallelcircuit are placed as shown in Table 84.

TABLE 84 Relative positions from the center of pole 1 2 3 4 5 6 ParallelUpper coil piece 1 1 circuits 1 and 4 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 2 and 5 Lower coil piece 1 1 ParallelUpper coil piece 1 1 circuits 3 and 6 Lower coil piece 1 1 Relativepositions from the center of pole 7 8 9 10 11 12 Parallel Upper coilpiece 1 1 circuits 1 and 4 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 2 and 5 Lower coil piece 1 1 Parallel Upper coilpiece 1 1 circuits 3 and 6 Lower coil piece 1 1

As shown in Table 84, four upper coil pieces 15 of the first and fourthparallel circuits are placed at 2nd, 5th, 7th and 12th positions fromthe pole center, and four lower coil pieces 16 of the first and fourthparallel circuits are placed at 1st, 6th, 9th, and 10th positions fromthe pole center. Four upper coil pieces 15 of the second and fifthparallel circuits are placed at 3rd, 4th, 8th, and 11th positions fromthe pole center, and four lower coil pieces 16 of the second and fifthparallel circuits are placed at 3rd, 4th, 7th, and 12th positions fromthe pole center. Four upper coil pieces 15 of the third and sixthparallel circuits are placed at 1st, 6th, 9th, and 10th positions fromthe pole center, and four lower coil pieces 16 of the third and sixthparallel circuits are placed at 2nd, 5th, 8th, and 11th positions fromthe pole center.

Therefore, the circuits of the upper coil piece 15 in the first phasebelt 17 are numbered 3, 1, 2, 2, 1, 3, 1, 2, 3, 3, 2, 1 sequentiallyfrom the pole center side, and the circuits of the lower coil piece 16are numbered 1, 3, 2, 2, 3, 1, 2, 3, 1, 1, 3, 2. The circuits of theupper coil piece 15 in the second phase belt 18 are numbered 6, 4, 5, 5,4, 6, 6, 4, 5, 6, 5, 4 sequentially from the pole center side, and thecircuits of the lower coil piece 16 are numbered 4, 6, 5, 5, 6, 4, 5, 6,4, 4, 6, 5 sequentially from the pole center side.

Table 85 shows the balance of the voltage generated in an armaturewinding in the twenty-ninth embodiment. In the embodiment, the balancevaries with a coil pitch. Table 85 shows a case where a winding pitch is30/36 (83.33%).

TABLE 85 Parallel circuit 1 2 3 4 5 6 Voltage 0.9969 1.0020 1.00100.9969 1.0020 1.0010 (p. u.) Voltage 0.118  0.000  −0.118 0.118  0.000 −0.118 phase (degree)

As shown in Table 85, in the armature winding in the twenty-ninthembodiment, a voltage deviation (a deviation of a p.u. voltage from 1.0)is 0.31% maximum, and a phase angle deviation is 0.12°. These valuesmeet the standard in the US patent of Rudolph Habermann Jr., 0.4% involtage deviation and 0.15° in phase angle, and the voltage balancehigher than that in the first embodiment is realized.

Table 86 shows a change in maximum voltage deviation and phase angledeviation with a winding pitch in the twenty-ninth embodiment. In apractical winding pitch range including those not shown in the table,the balance meets the standard in the US patent of Rudolph HabermannJr., 0.4% in voltage deviation and 0.15° in phase angle.

TABLE 86 Coil pitch 27/36 28/36 30/36 31/36 33/36 35/36 Voltage 0.30%0.30% 0.31% 0.31% 0.31% 0.32% deviation Phase angle 0.14° 0.13° 0.12°0.12° 0.13° 0.14° deviation

As described above, in the twenty-ninth embodiment, in the practicalwinding pitch range, the balance meeting the standard in the US patentof Rudolph Habermann Jr. is realized with respect to the voltages ofparallel circuits, and a circulation current can be decreased.

The embodiment is not limited to the illustrated configuration. Thelead-out positions may be different. For example, the coil pieceslocated at electrically equivalent positions in the parallel circuits 1and 4 may be replaced.

The invention is not limited to the embodiments described herein andshown in the drawings. The invention may be embodied in other variousforms without departing from the essential characteristics in practicalphases. The invention may be embodied in various forms by appropriatelycombining the constituent elements disclosed in the embodiments. Forexample, some constituent elements may be eliminated from thosedisclosed in the embodiments. Constituent elements of differentembodiments may be combined.

While certain embodiments have been described, these embodiments havebeen presented by way of example only, and are not intended to limit thescope of the inventions. Indeed, the novel embodiments described hereinmay be embodied in a variety of other forms; furthermore, variousomissions, substitutions and changes in the form of the embodimentsdescribed herein may be made without departing from the spirit of theinventions. The accompanying claims and their equivalents are intendedto cover such forms or modifications as would fall within the scope andspirit of the inventions.

The invention claimed is:
 1. A 3-phase 2-pole 2-layer armature windingof a rotating electrical machine, housed in 72 slots provided in alaminated iron core, the winding for each phase comprising: six parallelcircuits separated into two phase belts comprising first and secondphase belts, each parallel circuit comprising two coil pieces, an uppercoil piece and a lower coil piece connected in series with each other ata connection side coil end and at a non-connection side coil end; andthe parallel circuits being connected such that upper and lower coilpieces of first and fourth parallel circuits are placed at 2nd, 5th, 8thand 12th positions from the center of a pole; upper and lower coilpieces of second and fifth parallel circuits are placed at 3rd, 4th, 7thand 11th positions from the center of a pole; and upper and lower coilpieces of third and six parallel circuits are placed at 1^(st), 6^(th),9^(th) and 10^(th) positions from the center of a pole, when relativepositions of the upper and lower coil pieces in one phase belt areindicated by positions counted sequentially from the center of a pole.2. The armature winding of the rotating electrical machine according toclaim 1, wherein a winding pitch is in a range of 25/36 to 31/36.
 3. Thearmature winding of the rotating electrical machine according to claim1, wherein the parallel circuits of the upper and lower coil pieces ofthe first phase belt are numbered 3, 1, 2, 2, 1, 3, 2, 1, 3, 3, 2, 1sequentially from the center of a pole; and the parallel circuits of theupper and lower coil pieces of the second phase belt are numbered 6, 4,5, 5, 4, 6, 5, 4, 6, 6, 5, 4 sequentially from the center of a pole.